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URL Shortener REST API Bug

Spot the REST design mistake in a simple URL shortener API built with Express.

Codejavascript

const express = require('express');
const app = express();
app.use(express.json());

const store = {};

// Create a short URL
app.get('/urls', (req, res) => {
  const { longUrl } = req.body;
  const code = Math.random().toString(36).slice(2, 8);
  store[code] = longUrl;
  res.status(201).json({ code, shortUrl: `/${code}` });
});

// Redirect to the original URL
app.get('/:code', (req, res) => {
  const longUrl = store[req.params.code];
  if (!longUrl) return res.status(404).json({ error: 'Not found' });
  res.redirect(longUrl);
});

app.listen(3000);

What is the bug in this REST API design?

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